GB2204932A - Flexible composite hose - Google Patents

Flexible composite hose Download PDF

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Publication number
GB2204932A
GB2204932A GB8711444A GB8711444A GB2204932A GB 2204932 A GB2204932 A GB 2204932A GB 8711444 A GB8711444 A GB 8711444A GB 8711444 A GB8711444 A GB 8711444A GB 2204932 A GB2204932 A GB 2204932A
Authority
GB
Grant status
Application
Patent type
Prior art keywords
tube
hose
composite
flexible
inner
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB8711444A
Other versions
GB8711444D0 (en )
GB2204932B (en )
Inventor
Katsushi Washizu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Usui Kokusai Sangyo Kaisha Ltd
Original Assignee
Usui Kokusai Sangyo Kaisha Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L11/00Hoses, i.e. flexible pipes
    • F16L11/04Hoses, i.e. flexible pipes made of rubber or flexible plastics
    • F16L11/12Hoses, i.e. flexible pipes made of rubber or flexible plastics with arrangements for particular purposes, e.g. specially profiled, with protecting layer, heated, electrically conducting
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C61/00Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
    • B29C61/006Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor the force created by the liberation of the internal stresses being used for compression moulding or for pressing preformed material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C63/00Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
    • B29C63/38Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor by liberation of internal stresses
    • B29C63/42Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor by liberation of internal stresses using tubular layers or sheathings
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2009/00Layered products
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00Tubular articles
    • B29L2023/005Hoses, i.e. flexible

Description

1 1 2204932 FLEXIBLE COMPOSITE HOSE

BACKGROUND OF THE INVENTION

Field of the Invention:

The present invention relates to a plastics flexible composite hose of improved structure, especially the one having a comparatively small diameter less than about 20 mm. It has good oil resistance, chemical resistance, and pressure resistance, and it is characterized by its ability to resist the attack by fluids flowing inside thereof and a variety of substances that come into contact with the outside thereof. Because of these features, the flexible composite hose of the present invention will find use as a means to feed oil, gas, and chemical solutions in a large variety of machines and equipment including automobiles.

Description of the Prior Art:

The conventional flexible composite hose of the type to which the present invention pertains has a structure as shown in Fig. 4. It is made up of a comparatively thin-walled inner tube 11 of polyamide resin (such as nylon) or fluoroplastics (such as polytetrafluoroethylene known as "Teflon"), an adhesive tape 13 spirally wound round the outside 111 of the inner tube 11, a braid reinforcement 14 of fabric or net covering the adhesive tape 13, and an outer tube 12 formed by injection from a molten plastics material.

The conventional flexible composite hose of the above-mentioned structure has disadvantages. The winding of the adhesive tape 13, the 1 1 covering with the brain reinforcement 14, and the forming of the outer tube 12 by injection require a largescale apparatus and complex operations, which inevitably leads to high production cost. SUMMARY OF THE INVENTION

It is an object of the present invention to provide a flexible composite hose which can be made very easily at a low cost without loss of oil resistance, chemical resistance, and pressure resistance.

In order to overcome the above-mentioned disadvantages, the present inventors carried out a series of researches which led to the finding that the above-mentioned objective can be achieved with a hose made up of an inner tube and an outer tube of heat-shrinkable material. In other words, the present invention provides a flexible composite hose constructed such that a plastics inner tube is covered with an outer tube of heat-shrinkable material, with the inner tube being compressed by the shrinkage force of the outer tube.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a sectional view of the flexible composite hose of the invention.

Fig. 1.

Fig. 2 is a longitudinal sectional view taken along the line A-A in Fig. 3 is a longitudinal sectional view, equivalent to Fig. 2, of another embodiment.

Fig. 4 is a longitudinal sectional view, equivalent to Fig. 2, of a conventional flexible composite hose.

DETAILED DESCRIPTION OF THE INVENTION

2 j 4 According to the invention, the inner tube is made of a synthetic resin having flexibility and high oil resistance, chemical resistance, and pressure resistance. It includes, for example, polyamide resins and fluoroplastics. Examples of the former include nylon-11 (e.g., "Rilsan"), nylon-12 (e.g., "Daiamid" and "Grilamid"), and nylon-6 (e.g., "Amilan"); and examples of the latter include polytetrafluoroethylene (e.g., "Teflon TFE11), tetrafluoroethylene-hexafluoropropylene copolymer (e.g., "Neoflon FEP11), and tetrafluoroethylene-perfluoroalkoxyethylene copolymer (e.g., "Teflon PFA11), which are commercially available. The inner tube may have a comparatively-thin wall thickness and any length desired.

The outer tube is made of a heat-shrinkable synthetic resin. Upon heating, it shrinks in the radial direction at a ratio of from 1-3:1 to 4:1 and it shrinks or expands in the lengthwise direction by 5% to 101YO1. As with the inner tube, it should preferably be made of a material having flexibility and high oil resistance, chemical resistance, and pressure resistance. Examples of such a material include crosslinked polyolefins, fluoroplastics, and synthetic rubbers. The last is desirable where the hose is required to have flexibility, resilience, recovery from deformation, flex cracking resistance, and abrasion resistance.

The crosslinked polyolefin is one which has the three-dimensional network structure of polymer molecules. It is produced by irradiating a polyolefin with high energy electron rays. It is commercially available under the trade name of "Penntubell, "Insultitell, "Thermofit Tube", and 3 i k "Sumitubell.

Examples of heat-shrinkable fluoroplastics include polytetrafluoroethylene (e.g., "Teflon TFE11), tetrafluoroethylene- hexafluoropropylene copolymer, polytetrafluoroethylene having perfluoroalkoxy groups, ethylene-tetrafluoroethylene copolymer, and polyvinylidene fluoride. Heat-shrinkable tubes made of them are commercially available under the trade name of, for example, "Penntubell.

Examples of heat-shrinkable synthetic rubbers include chloroprene rubber (e.g., "Neoprene") and crosslinked fluororubber (e.g., I'Viton"). Heatshrinkable tubes made of them are commercially available under the trade name of, for exmaple, "Insultite".

The flexible composite hose of the invention is produced by the following steps. First, the inner tube 1 having a comparatively thin wall (as shown in Fig. 1) is produced from an appropriate material selected according to the intended application. Then, the inner tube is covered with the outer tube having an inside diameter slightly larger than the outside diameter of the inner tube 1. The material for the outer tube is properly selected according to the intended application. Finally, the resulting doublewalled tube assembly is passed through an electric furnace at a speed of 0.5 to 1 m/min, while being kept straight. The electric furnace is heated to a temperature at which the outer tube 2 shrinks as desired. The heat shrinkage causes the outer tube 2 to apply compressive force to the inner tube 1.

In an alternative embodiment, an adhesive 3 may be interposed between the inner tube 1 and the outer tube 2 as shown in Fig. 3. The 4 adhesive may be previously applied to the outside 11 of the inner tube 1 by a proper means. -It is also possible to use an outer tube with its inside previously coated with a fusible liner or hot-melt adhesive. Examples of the adhesive include polyamide adhesives and polyvinyl acetate adhesives which are commonly used for the production of composite hose of the type to which the present invention pertains.

The flexible composite hose of the invention has high pressure resistance because the outer tube exerts an inward force to the inner tube due to its heat shrinkage. The heat shrinking can be accomplished simply by passing the double-walled hose assembly through a heating oven. The thin- walled inner tube can be easily produced from polyamide resin or fluoroplastics, and the inner tube can be covered with the outer tube in a few steps by using a small-scale apparatus. The flexible composite hose has good resistance to oil and chemicals which come into contact with both the inside and outside. In addition, it can be made in any length and size desired.

The invention is now described in more detail with reference to the following examples. Example 1 An inner tube measuring 10 mm in outside diameter, 0.5 mm thick, and 50 cm long, made of polytetrafluoroethylene ("Teflon"), was covered with an outer tube measuring 12.7 mm in inside diameter, 0.7 mm thick, and 50 cm long, made of crosslinked polyolefin ("Insultite VFP-87611). The tube assembly in the straight form was passed through an electric furnace at 120 to 1400C at a speed of 1 m/min to effect heat shrinkage.

Thus there was obtained a composite hose as shown in Figs. 1 and 2. The composite hose was flexible and superior in chemical resistance and pressure resistance. It was suitable for alcohol fuel piping. Example 2 An inner tube measuring 4.6 mm in outside diameter, 0.3 mm thick, and 50 em long, made of polyamide resin (nylon), was covered with an outer tube measuring 6.4 m in inside diameter, 0.9 mm thick, and 50 em long, made of chloroprene rubber PNeoprene"). The tube assembly in the straight form was passed through an electric furnace at 140 to 1500C at a speed of 0.5 m/min to effect heat shrinkage. Thus there was obtained a composite hose as shown in Figs. 1 and 2. The composite hose was flexible and superior in heat resistance. It was suitable for fuel piping in the automotive engine room. Example 3 An inner tube measuring 7.0 mm in outside diameter, 0.8 mm thick, and 50 em long, made of polyamide resin (nylon) and coated with a polyamide adhesive, was covered with an outer tube measuring 9.5 mm in inside diameter, 0.3 mm thick, and 50 em long, made of polytetrafluoroethylene having perfluoroalkoxy groups on the side chains (11Penntube PFA11). The tube assembly in the straight form was passed through an electric furnace at 160 to 1700C at a speed of 0.5 m/min to effect heat shrinkage. Thus there was obtained a composite hose which has an adhesive layer interposed between the inner tube and the outer tube as shown in Fig. 3. The composite hose was flexible and had the external surface superior in chemical resistance. It was suitable for air, 6 A 1 r'.

vacuum, and fuel piping in the automotive engine room where it might b attacked by battery solution (containing sulfuric acid).

1 7

Claims (11)

WHAT IS CLAIMED IS:
1. A flexible composite hose which comprises an inner tube of synthetic resin and an outer tube of heat-shrinkable material, with the inner tube being compressed by the shrinkage force of the outer tube.
2. A flexible composite hose as claimed in Claim 1, wherein the outer tube is made of a synthetic resin which shrinks in the radial direction at a ratio of 1-.3:1 to 4:1 and shrinks or expands in the lengthwise direction by 5 to 10%.
3. A flexible composite hose as claimed in Claim 1 or 2, wherein the outer tube is made of one member selected from the group consisting of crosslinked polyolefin resins, fluoroplastics, and synthetic rubbers.
4. A flexible composite hose as claimed in Claim 3, wherein the crosslinked polyolefin is one which is produced by irradiating a polyolefin with high-energy electron rays to produce the threedimensional network structure through the crosslinking of polymer molecules.
5. A flexible composite hose as claimed in Claim 3, wherein the fluoroplastics is one member selected from the group consisting of polytetrafluoroethylene, tetrafluoroethylene-hexafluoropropylene copolymer, polytetrafluoroethylene having perfluoroalkoxy groups on the side chains, and polyvinylidene fluoride.
6. A flexible composite hose as claimed in Claim 3, wherein the synthetic rubber is chloroprene rubber or crosslinked fluororubber.
7. A flexible composite hose as claimed in Claim 1, wherein the inner tube is made of polyamide resin or fluoroplastics.
8. A flexible composite hose as claimed in Claim 7, wherein the 8 1k i i k w.
polyamide resin is one member selected from the group consisting of nylon11, nylon-12,.and nylon-6.
9. A flexible composite hose as claimed in Claim 7, wherein the fluoroplastics Is one member selected from the group consisting of polytetrafluoroethylene, tetrafluoroethylene-hexafluoropropylene copolymer, and tetrafluoroethylene-perfluoroalkoxyethylene copolymer.
10. A flexible composite hose as claimed in Claim 1, which further comprises an adhesive layer interposed between the inner tube and the outer tube.
11. A flexible composite hose as claimed in Claim 10, wherein the adhesive is a polyamide-based adhesive or polyvinyl acetate-based adhesive.
9 Published 1988 at The Patent Offlice, State House, 66171 High Holborn, London WCIR 4TP. Further copies may be obtained from The Patent Oface, Sales Branch, St Mary Cray, Orpington, Kent BR5 3RD. Printed by Multiplex techniques ltd, St Mary Cray, Kent. Con. 1/87.
GB8711444A 1987-05-14 1987-05-14 Flexible composite hose Expired - Fee Related GB2204932B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8711444A GB2204932B (en) 1987-05-14 1987-05-14 Flexible composite hose

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8711444A GB2204932B (en) 1987-05-14 1987-05-14 Flexible composite hose
DE19873717650 DE3717650A1 (en) 1987-05-14 1987-05-26 Flexible multi-layer hose

Publications (3)

Publication Number Publication Date
GB8711444D0 GB8711444D0 (en) 1987-06-17
GB2204932A true true GB2204932A (en) 1988-11-23
GB2204932B GB2204932B (en) 1991-12-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB8711444A Expired - Fee Related GB2204932B (en) 1987-05-14 1987-05-14 Flexible composite hose

Country Status (2)

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DE (1) DE3717650A1 (en)
GB (1) GB2204932B (en)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991004432A1 (en) * 1989-09-12 1991-04-04 Paguag Gmbh & Co. Hose
EP0483657A1 (en) * 1990-10-27 1992-05-06 Dynamit Nobel Aktiengesellschaft Process for fabrication a sheathed detonating cord
US5225621A (en) * 1990-10-27 1993-07-06 Dynamit Nobel Aktiengesellschaft Process for producing a jacketed fuse and fuse product
EP0551094A1 (en) * 1992-01-06 1993-07-14 Pilot Industries, Inc. Fluoropolymer composite tube and method of preparation
WO1996000657A1 (en) * 1994-06-30 1996-01-11 Cadillac Rubber & Plastics, Inc. Composite fuel and vapor barrier tube and process for making same
US5512225A (en) * 1994-10-24 1996-04-30 Minnesota Mining And Manufacturing Company Method of increasing interlayer adhesion of multi-layer compositions having a fluoroplastic layer
EP0731308A1 (en) * 1995-03-09 1996-09-11 Elf Atochem S.A. Polyamid based tubes for the transport of fuel
US5656121A (en) * 1994-08-19 1997-08-12 Minnesota Mining And Manufacturing Company Method of making multi-layer composites having a fluoropolymer layer
US5658670A (en) * 1994-08-19 1997-08-19 Minnesota Mining And Manufactury Company Multi-layer compositions having a fluoropolymer layer
US5759329A (en) * 1992-01-06 1998-06-02 Pilot Industries, Inc. Fluoropolymer composite tube and method of preparation
US5855977A (en) * 1996-08-26 1999-01-05 Minnesota Mining And Manufacturing Company Multi-layer compositions comprising a fluoropolymer
US5916404A (en) * 1992-01-06 1999-06-29 Pilot Industries, Inc. Fluoropolymer composite tube and method of preparation
US5941286A (en) * 1994-06-30 1999-08-24 Cadillac Rubber & Plastics, Inc. Composite fuel and vapor barrier tube and process for making same
US6197393B1 (en) 1997-06-27 2001-03-06 3M Innovative Properties Company Multi-layer compositions comprising a fluoropolymer
US6517657B1 (en) 1992-01-06 2003-02-11 Pilot Industries, Inc. Fluoropolymer composite tube and method of preparation

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4009518A1 (en) * 1989-04-07 1990-10-11 Jaeger & Sohn Impuls Apparate Steam iron connected to steam generator via tube - comprising inner tube made of PTFE and outer silicone tube
DE10063001B4 (en) * 2000-12-16 2005-09-15 Elringklinger Ag Two- or multi-layer hose as well as methods for the preparation thereof

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB920677A (en) *
GB882363A (en) * 1959-09-23 1961-11-15 Compoflex Co Ltd Improvements in or relating to the manufacture of hosepipes
GB915052A (en) * 1958-02-18 1963-01-09 British Insulated Callenders Improvements in or relating to electrical insulators
GB994760A (en) * 1962-10-19 1965-06-10 Johns Manville Thermoplastic jacketed air duct and method of making same
GB1005577A (en) * 1963-08-30 1965-09-22 Alfred Roberts And Sons Ltd Manufacture of flexible high pressure hose
GB1062043A (en) * 1962-07-23 1967-03-15 Raychem Corp Recoverable article with fusible insert
GB1074909A (en) * 1965-01-15 1967-07-05 American Biltrite Rubber Co Process of curing rubberized hose
GB1417561A (en) * 1972-06-14 1975-12-10 Atlas Copco Ab Abrasion resistant devices

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3133091A1 (en) * 1981-08-21 1983-03-10 Kabelmetal Electro Gmbh "Shrinking molding short len ​​as shrinking cap, -schlauchmanschette and the like"

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB920677A (en) *
GB915052A (en) * 1958-02-18 1963-01-09 British Insulated Callenders Improvements in or relating to electrical insulators
GB882363A (en) * 1959-09-23 1961-11-15 Compoflex Co Ltd Improvements in or relating to the manufacture of hosepipes
GB1062043A (en) * 1962-07-23 1967-03-15 Raychem Corp Recoverable article with fusible insert
GB994760A (en) * 1962-10-19 1965-06-10 Johns Manville Thermoplastic jacketed air duct and method of making same
GB1005577A (en) * 1963-08-30 1965-09-22 Alfred Roberts And Sons Ltd Manufacture of flexible high pressure hose
GB1074909A (en) * 1965-01-15 1967-07-05 American Biltrite Rubber Co Process of curing rubberized hose
GB1417561A (en) * 1972-06-14 1975-12-10 Atlas Copco Ab Abrasion resistant devices

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991004432A1 (en) * 1989-09-12 1991-04-04 Paguag Gmbh & Co. Hose
EP0483657A1 (en) * 1990-10-27 1992-05-06 Dynamit Nobel Aktiengesellschaft Process for fabrication a sheathed detonating cord
US5225621A (en) * 1990-10-27 1993-07-06 Dynamit Nobel Aktiengesellschaft Process for producing a jacketed fuse and fuse product
EP0551094A1 (en) * 1992-01-06 1993-07-14 Pilot Industries, Inc. Fluoropolymer composite tube and method of preparation
US5958532A (en) * 1992-01-06 1999-09-28 Pilot Industries, Inc. Fluoropolymer composite tube and method of preparation
US5500257A (en) * 1992-01-06 1996-03-19 Pilot Industries, Inc. Method of preparing a fluoropolymer composite
US5916404A (en) * 1992-01-06 1999-06-29 Pilot Industries, Inc. Fluoropolymer composite tube and method of preparation
US5554425A (en) * 1992-01-06 1996-09-10 Pilot Industries, Inc. Fluoropolymer composite tube and method of preparation
US5759329A (en) * 1992-01-06 1998-06-02 Pilot Industries, Inc. Fluoropolymer composite tube and method of preparation
US6517657B1 (en) 1992-01-06 2003-02-11 Pilot Industries, Inc. Fluoropolymer composite tube and method of preparation
US5941286A (en) * 1994-06-30 1999-08-24 Cadillac Rubber & Plastics, Inc. Composite fuel and vapor barrier tube and process for making same
WO1996000657A1 (en) * 1994-06-30 1996-01-11 Cadillac Rubber & Plastics, Inc. Composite fuel and vapor barrier tube and process for making same
US6074719A (en) * 1994-08-19 2000-06-13 3M Innovative Properties Company Multi-layer compositions having a fluoropolymer layer
US5827587A (en) * 1994-08-19 1998-10-27 Minnesota Mining And Manufacturing Company Multi-layer compositions having a fluoropolymer layer
US5658670A (en) * 1994-08-19 1997-08-19 Minnesota Mining And Manufactury Company Multi-layer compositions having a fluoropolymer layer
US5656121A (en) * 1994-08-19 1997-08-12 Minnesota Mining And Manufacturing Company Method of making multi-layer composites having a fluoropolymer layer
US5626930A (en) * 1994-10-24 1997-05-06 Minnesota Mining And Manufacturing Company Multi-layer compositions having a fluoroplastic layer
US5512225A (en) * 1994-10-24 1996-04-30 Minnesota Mining And Manufacturing Company Method of increasing interlayer adhesion of multi-layer compositions having a fluoroplastic layer
EP0731308A1 (en) * 1995-03-09 1996-09-11 Elf Atochem S.A. Polyamid based tubes for the transport of fuel
US6177162B1 (en) 1995-03-09 2001-01-23 Atofina Polyamide-based pipes for conveying petrol
US5855977A (en) * 1996-08-26 1999-01-05 Minnesota Mining And Manufacturing Company Multi-layer compositions comprising a fluoropolymer
US6197393B1 (en) 1997-06-27 2001-03-06 3M Innovative Properties Company Multi-layer compositions comprising a fluoropolymer

Also Published As

Publication number Publication date Type
GB8711444D0 (en) 1987-06-17 grant
GB2204932B (en) 1991-12-11 grant
DE3717650A1 (en) 1988-12-15 application

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PCNP Patent ceased through non-payment of renewal fee

Effective date: 20050514